scan firewall for open ports

Vi/etc/sysconfig/iptables-A input-m state–state new-m tcp-p tcp–dport 80-j ACCEPT (allow 80 ports through the firewall)-A input-m state–state new-m tcp-p tcp–dport 3306-j ACCEPT (Allow 3306 ports through the firewall)Special Tips:Many netizens add these two rules to the last line of the

Open a specific port (iptables) to the CentOS Firewall)Iptables is the firewall and service name in linux.Service iptables status view Firewall status service iptables start Enable Firewall service iptables stop disable Firewall s

Open ports: The code is as follows Copy Code [root@wx32 ~]# iptables-i input-p tcp--dport 80-j ACCEPT Save configuration: The code is as follows Copy Code [root@wx32 ~]# Service Iptables SaveSaving firewall rules to/etc/sysconfig/iptables: [OK] Reboot the

Turn ON/offsudo ufw allow|deny [service]Open or close a port, for example:sudo UFW allow SMTP allows all external IPs to access native 25/TCP (SMTP) portssudo ufw allow 22/tcp allows all external IPs to access the native 22/tcp (SSH) port This is important, ssh telnet is used for SECURECRT and other software suggestions to open. Or do not open the firewall.sudo U

Today friend asked a question, the firewall has set 21 port open, but the firewall opens, the FTP server is not connected. Using serv-u FTP Server software. I remember having encountered the same problem before, and then checking the data, finally turned over to the solution and shared the solution as follows: Set the allowed passive mode of the site that is al

After CentOS is installed, only port 22 is enabled by default. if you want to open other ports, you need to open the required ports. For example, open the default port 80 for http edit iptablesvi/etc/sysconfig/iptables add-ARH-Firewall